Definition: mammals

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Source: Webster's Revised Unabridged Dictionary (1913) 

Mammal \Mam"mal\, n.; pl. Mammals. [L. mammalis belonging to
   the breast, fr. mamma the breast or pap: cf. F. mammal.]
   (Zo["o]l.)
   One of the Mammalia.

   Age of mammals. See under Age, n., 8.